2002A&A...385..412M

Query : 2002A&A...385..412M

2002A&A...385..412M - Astronomy and Astrophysics, volume 385, 412-424 (2002/4-2)

Radio continuum and CO emission in star-forming galaxies.

MURGIA M., CRAPSI A., MOSCADELLI L. and GREGORINI L.

Abstract (from CDS):

We combine the radio continuum images from the NRAO VLA Sky Survey with the CO-line observations from the extragalactic CO survey of the Five College Radio Astronomy Observatory to study the relationship between molecular gas and the star formation rate within the disks of 180 spiral galaxies at 45" resolution. We find a tight correlation between these quantities. On average, the ratio between the radio continuum and the CO emission is constant, within a factor of 3, both inside the same galaxy and from galaxy to galaxy. The mean star formation efficiency deduced from the radio continuum corresponds to convert 3.5% of the available molecular gas into stars on a time scale of 10⁸yr and depends weakly on general galaxy properties, such as Hubble type or nuclear activity. A comparison is made with another similar analysis performed using the H_α luminosity as star formation indicator. The overall agreement we find between the two studies reinforces the use of the radio luminosity as star formation rate indicator not only on global but also on local scales.

Abstract Copyright: ∼

Journal keyword(s): radio continuum: galaxies - galaxies: spiral - ISM: molecules - stars: formation

Simbad objects: 29

Full paper

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Number of rows : 29

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	NGC 253	SyG	00 47 33.134	-25 17 19.68		8.03		6.94	8.1	~	3221	2
2	NGC 520	IG	01 24 35.071	+03 47 32.68	12.41	12.24	11.42			~	505	3
3	M 33	GiG	01 33 50.8965749232	+30 39 36.630403128	6.17	6.27	5.72			~	5666	1
4	NGC 660	Sy2	01 43 02.350	+13 38 44.45		12.02	11.16			~	549	2
5	NGC 1055	GiP	02 41 45.233	+00 26 35.45	11.59	11.40	10.59	10.5	10.7	~	277	2
6	M 77	GiP	02 42 40.7091669408	-00 00 47.859690204	9.70	9.61	8.87	10.1	9.9	~	4457	2
7	IC 342	SBG	03 46 48.514	+68 05 45.98		10.5				~	1480	1
8	NGC 2146	SBG	06 18 37.710	+78 21 25.27	11.67	11.38	10.59			~	688	2
9	NGC 2655	LIN	08 55 37.731	+78 13 23.10		12.03	11.08			~	284	2
10	NGC 2841	LIN	09 22 02.6778711696	+50 58 35.737082868	10.43	10.09	9.22			~	1044	1
11	M 82	IG	09 55 52.430	+69 40 46.93	9.61	9.30	8.41			~	5721	6
12	NGC 3079	Sy2	10 01 57.8789863992	+55 40 47.449758324	11.57	11.54	10.86			~	1355	3
13	NGC 3310	AGN	10 38 45.85707	+53 30 11.8940		12.45	12.15			~	760	1
14	M 96	GiP	10 46 45.744	+11 49 11.78	10.42	10.15	9.25	8.99		~	795	1
15	NGC 3521	LSB	11 05 48.5680991376	-00 02 09.245076540	10.06	9.83	9.02	10.1	9.6	~	780	2
16	NGC 3628	GiP	11 20 17.018	+13 35 22.16		10.42	9.48	9.22		~	809	3
17	NGC 4151	Sy1	12 10 32.5759813872	+39 24 21.063527532		12.18	11.48			~	3602	2
18	NGC 4302	GiP	12 21 42.477	+14 35 51.94		13.4	11.61			~	317	0
19	M 100	AGN	12 22 54.9299993592	+15 49 20.296257960	10.04	10.05	9.35			~	1780	2
20	NGC 4388	Sy2	12 25 46.820	+12 39 43.45	11.91	11.76	11.02			~	1299	2
21	NAME Virgo Cluster	ClG	12 26 32.1	+12 43 24						~	6449	0
22	IRAS 12315+0758	GiG	12 34 03.029	+07 41 56.90		10.6				~	650	0
23	NGC 4535	H2G	12 34 20.3443516704	+08 11 51.908488116		11.1				~	588	0
24	NGC 4710	H2G	12 49 38.958	+15 09 55.76		11.6				~	303	0
25	NGC 4866	LIN	12 59 27.0952921176	+14 10 16.382228232		11.9				~	203	0
26	M 83	SBG	13 37 00.91920	-29 51 56.7400	8.85	8.11	7.52	7.21		~	2487	2
27	NGC 5247	GiG	13 38 03.0183262176	-17 53 02.645511252		10.77		9.96	10.5	~	214	0
28	NGC 6503	LIN	17 49 26.4207792072	+70 08 39.604132176	11.56	10.95	10.28	9.92		~	500	1
29	NAME Local Group	GrG	~	~						~	8040	0

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